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Method for removing fluorine and chlorine from zinc hydrometallurgy electrolysis circulation liquid

A technology of hydrometallurgy and circulating liquid, which is applied in the direction of electrolysis process, electrolysis components, process efficiency improvement, etc. It can solve the problems of lowering the grade of zinc ingots, complicated processing technology, and shortened life of plates, so as to reduce processing costs, The process is simple and the effect of reducing investment

Pending Publication Date: 2021-06-01
BAIYIN NONFERROUS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the zinc hydrometallurgy process, during the circulation process of the zinc electrolytic circulation solution, the fluoride and chloride ions in the solution will be seriously over-high due to the accumulation, which will cause potential harm to the zinc smelting electrolysis system. First, it will cause corrosion to the entire equipment. The second is to bring power consumption during the electrolysis process, which affects the efficiency of the electrolysis current. The third is to release fluorine, chlorine, etc. during the electrolysis, corroding the plate, shortening the life of the plate, and reducing the content of impurities such as zinc and lead in the cathode. increase and reduce the grade of zinc ingots; at present, there are many methods for removing fluoride and chloride ions in zinc electrolytic circulating liquid, but there are generally problems of low removal efficiency, complicated treatment process, long time and high cost. Suitable for large-scale promotion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] This embodiment provides a method for removing fluorine and chlorine from the electrolytic circulating liquid of zinc hydrometallurgy, comprising the following steps:

[0023] (1) select the copper slag produced by the zinc hydrometallurgy purification process, the massfraction of copper in this copper slag is greater than 50%, the copper slag is broken and crossed 140 mesh sieves;

[0024] (2) Calcium oxide is added to the circulating liquid of zinc hydrosmelting electrolysis, the amount of calcium oxide added is 1.5 times of the mass of fluorine in the circulating liquid of zinc hydrosmelting electrolysis, stirred evenly, heated and reacted at 60°C for 60 minutes, during the reaction process with 1500 Stir at a speed of rev / min, and filter with a plate and frame filter press to obtain calcium fluoride precipitate and fluorine sinking liquid;

[0025] (3) Adjust the pH of the liquid after fluorine sinking to 1.5-3.5, add copper slag, the amount of copper slag added is ...

Embodiment 2

[0028] This embodiment provides a method for removing fluorine and chlorine from the electrolytic circulating liquid of zinc hydrometallurgy, comprising the following steps:

[0029] (1) select the copper slag produced by the zinc hydrometallurgy purification process, the massfraction of copper in this copper slag is greater than 50%, the copper slag is broken and crossed 170 mesh sieves;

[0030] (2) Calcium oxide is added to the circulating liquid of zinc hydrosmelting electrolysis, the amount of calcium oxide added is twice the mass of fluorine in the circulating liquid of zinc hydrosmelting electrolysis, stirred evenly, heated and reacted at 80°C for 80 minutes, during the reaction process with 2000 Stir at a speed of rev / min, and filter with a plate and frame filter press to obtain calcium fluoride precipitate and fluorine sinking liquid;

[0031] (3) Adjust the pH of the liquid after fluoride sinking to 1.5-3.5, add copper slag, the amount of copper slag added is twice t...

Embodiment 3

[0034] This embodiment provides a method for removing fluorine and chlorine from the electrolytic circulating liquid of zinc hydrometallurgy, comprising the following steps:

[0035] (1) select the copper slag produced by the zinc hydrometallurgy purification process, the massfraction of copper in this copper slag is greater than 50%, the copper slag is broken and crossed 200 mesh sieves;

[0036] (2) Calcium oxide is added to the circulating liquid of zinc hydro-smelting electrolysis. The amount of calcium oxide added is 2.5 times the mass of fluorine in the circulating liquid of zinc hydro-smelting electrolysis. Stir evenly and heat the reaction at 70°C for 40 minutes. Stir at a speed of rev / min, and filter with a plate and frame filter press to obtain calcium fluoride precipitate and fluorine sinking liquid;

[0037] (3) Adjust the pH of the liquid after fluorine sinking to 1.5-3.5, add copper slag, the amount of copper slag added is 3 times of the mass of chlorine in the e...

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Abstract

The invention discloses a method for removing fluorine and chlorine from zinc hydrometallurgy electrolysis circulation liquid, and belongs to the technical field of hydrometallurgy. The method for removing the fluorine and the chlorine from the zinc hydrometallurgy electrolysis circulation liquid is used for removing fluoride ions and chloride ions in the zinc hydrometallurgy electrolysis circulation liquid. The method for removing the fluorine and the chlorine from the zinc hydrometallurgy electrolysis circulation liquid comprises the following steps: (1) adding calcium oxide into the zinc hydrometallurgy electrolysis circulation liquid, carrying out a reaction, and conducting filtering to obtain calcium fluoride sediment and post-calcium-sedimentation liquid; (2) adjusting a pH value of the post-calcium-sedimentation liquid to be 1.5-3.5, adding copper slag, carrying out a reaction, and conducting filtering to obtain copper chloride sediment and electrolysis circulation liquid with the fluorine and the chlorine removed; and (3) returning the zinc hydrometallurgy electrolysis circulation liquid with the fluorine and the chlorine removed to a zinc smelting system for use, and when a concentration of fluoride ions in the zinc hydrometallurgy electrolysis circulation liquid is larger than 150 mg / L after accumulation of the fluoride ions and a concentration of chloride ions in the zinc hydrometallurgy electrolysis circulation liquid is larger than 200 mg / L after accumulation of the chloride ions, repeating the step (1) to the step (2). By means of the method, the fluoride ions and the chloride ions in the zinc hydrometallurgy electrolysis circulation liquid can be effectively removed, raw materials are easy to obtain, the technology is simple, the investment cost is low, and the method has good fluorine and chlorine removal effects, and is suitable for large-scale application and popularization.

Description

technical field [0001] The invention discloses a method for removing fluorine and chlorine from the electrolytic circulating liquid of zinc hydrometallurgy, which is used for removing fluorine and chloride ions in the electrolytic circulating liquid of zinc hydrometallurgy, and belongs to the technical field of hydrometallurgy. Background technique [0002] Zinc hydrometallurgy refers to the method of leaching zinc from zinc oxide calcine or other materials with an acidic solution, and then using electrolytic deposition technology to prepare metal zinc from the zinc leaching solution. Zinc hydrometallurgy mainly includes zinc concentrate roasting, zinc roasting Sand leaching, leaching solution purification and impurity removal and zinc electrolytic deposition and other processes. [0003] In the zinc hydrometallurgy process, during the circulation process of the zinc electrolytic circulation solution, the fluoride and chloride ions in the solution will be seriously over-high...

Claims

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Application Information

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IPC IPC(8): C25C7/06C25C1/16
CPCC25C7/06C25C1/16Y02P10/20
Inventor 王普公王军辉焦晓斌席多祥夏青郭永峰杨斌冶玉花崔耀牛棽葳
Owner BAIYIN NONFERROUS GROUP
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